SMART CUT Layer Transfer Using Absorbent Element to Dampen Acoustic Vibrations
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Solution Overview
Problem
The SMART CUT method for transferring a useful layer onto a supporting substrate results in periodic thickness variations due to interaction between the fracture wave and acoustic vibrations, which are difficult to correct using customary finishing techniques.
Innovation Solution
Incorporating an absorbent element to capture and dissipate acoustic vibrations during the fracture wave initiation and propagation, reducing the size of the periodic pattern of thickness variation by ensuring close contact and effective absorption of these vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the SMART CUT method is used to transfer a useful layer onto a supporting substrate, then the useful layer can be obtained with controlled thickness, but periodic thickness variations appear due to interaction between the fracture wave and acoustic vibrations
Solution Approach 1:
The patent applies an absorbent element to capture and dissipate the acoustic vibrations that cause periodic thickness variations. By converting the harmful acoustic energy into heat through absorption, the method eliminates the periodic patterns while maintaining the useful layer transfer process. This resolves the technical contradiction by neutralizing the harmful factor without sacrificing the manufacturing precision of the useful layer thickness.
2Manufacturing precision
If customary finishing techniques such as etching or thermal treatments are applied to correct thickness variations, then some uniformity improvement may be achieved, but these techniques are ineffective in the wavelength range of the periodic patterns
Solution Approach 1:
The patent implements the absorbent element during the fracture wave propagation step, before the finishing steps are applied. This preliminary action prevents the periodic thickness variations from being imprinted on the useful layer in the first place, making subsequent finishing techniques effective for their intended purposes rather than requiring them to correct this specific wavelength-range problem.
3Productivity
If the fracture wave propagates through the first substrate to transfer the useful layer, then the useful layer can be detached and transferred, but acoustic vibrations are generated that create periodic thickness patterns
Solution Approach 1:
The absorbent element acts as an intermediary between the fracture wave propagation process and the useful layer. It is positioned to capture acoustic vibrations during fracture wave propagation, thereby mediating the interaction between the dynamic fracture process and the static useful layer, preventing the vibrations from being transferred to the useful layer while maintaining transfer efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of absorbent elements significantly reduces the size of the periodic pattern of thickness variation, enabling the achievement of the required uniformity level for silicon-on-insulator substrates, particularly in large substrates like those with diameters of 300 mm.
Implementation Method 1
at least one of the sides of the assembly to be fractured is in close contact, over a contact zone, with an absorbent element suitable for capturing and dissipating the acoustic vibrations emitted during the initiation and/or propagation of the fracture wave
Implementation Method 2
the initiation and self-sustained propagation of a fracture wave in the first substrate 1 along the fragilization plane 2
Implementation Method 3
the formation of a fragilization plane 2 through the implantation of light species into a first substrate 1
Implementation Method 4
the thermal fragilization treatment of the assembly to be fractured 5
Data Source
AI summary
A method for transferring a useful layer onto a support includes the following processes: formation of a fragilization plane through the implantation of light species into a first substrate in such a way as to form a useful layer between this plane and a surface of the first substrate; application of the support onto the surface of the first substrate to form an assembly to be fractured having two exposed sides; thermal fragilization treatment of the assembly to be fractured; and initiation and self-sustained propagation of a fracture wave in the first substrate along the fragilization plane. At least one of the sides of the assembly to be fractured is in close contact, over a contact zone, with an absorbent element suitable for capturing and dissipating acoustic vibrations emitted during the initiation and/or propagation of the fracture wave.